Preheat pellet grill to 250 degrees. We used competition blend pellets in the pellet grill.
Pound chicken breasts flat, about 1/2'' thick. Rub dry rub all over chicken breasts.
Place chicken breasts on smoker. Insert temperature probe into middle of chicken breasts. Close pellet grill lid and cook at 250 degrees for about 30 minutes or until the chicken reaches 165 degrees F. Remove from pellet grill and let rest 5-10 minutes.